npmx Link Router

Opens npmjs.com package and search links through npmx.dev before navigation when possible.
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// ==UserScript==
// @name             npmx Link Router
// @name:en          npmx Link Router
// @name:ru          npmx Link Router — открывать npm-ссылки через npmx.dev
// @name:es          npmx Link Router — abrir enlaces npm mediante npmx.dev
// @name:zh-CN       npmx Link Router — 通过 npmx.dev 打开 npm 链接
// @name:pt-BR       npmx Link Router — abrir links npm pelo npmx.dev
// @namespace        https://github.com/wolfcreative/npmx-link-router
// @version          1.1.0
// @description      Opens npmjs.com package and search links through npmx.dev before navigation when possible.
// @description:en   Opens npmjs.com package and search links through npmx.dev before navigation when possible.
// @description:ru   Открывает ссылки npmjs.com на пакеты и поиск через npmx.dev до перехода, когда это возможно.
// @description:es   Abre enlaces de paquetes y búsqueda de npmjs.com mediante npmx.dev antes de navegar cuando es posible.
// @description:zh-CN 尽可能在跳转前通过 npmx.dev 打开 npmjs.com 的包和搜索链接。
// @description:pt-BR Abre links de pacotes e busca do npmjs.com pelo npmx.dev antes da navegação quando possível.
// @author           wolfcreative
// @license          MIT
// @homepageURL      https://github.com/wolfcreative/npmx-link-router
// @source           https://github.com/wolfcreative/npmx-link-router.git
// @supportURL       https://github.com/wolfcreative/npmx-link-router/issues
// @match            *://*/*
// @run-at           document-start
// @grant            none
// ==/UserScript==

(() => {
  'use strict';

  const NPM_HOSTS = new Set(['npmjs.com', 'www.npmjs.com']);
  const NPMX_HOST = 'npmx.dev';

  function toNpmxUrl(inputUrl) {
    let url;

    try {
      url = new URL(inputUrl, window.location.href);
    } catch {
      return null;
    }

    if (!NPM_HOSTS.has(url.hostname)) {
      return null;
    }

    url.protocol = 'https:';
    url.hostname = NPMX_HOST;

    return url.toString();
  }

  function redirectCurrentPage() {
    const nextUrl = toNpmxUrl(window.location.href);

    if (nextUrl && nextUrl !== window.location.href) {
      window.stop();
      window.location.replace(nextUrl);
    }
  }

  function rewriteAnchor(anchor) {
    if (!anchor) {
      return null;
    }

    const href = anchor.getAttribute('href');

    if (
      !href ||
      href.startsWith('#') ||
      href.startsWith('javascript:') ||
      href.startsWith('mailto:')
    ) {
      return null;
    }

    const nextUrl = toNpmxUrl(href);

    if (!nextUrl) {
      return null;
    }

    anchor.href = nextUrl;
    anchor.dataset.npmxLinkRouter = 'true';

    return nextUrl;
  }

  function findAnchor(event) {
    return event.target?.closest?.('a[href]') || null;
  }

  function rewriteEventLink(event) {
    rewriteAnchor(findAnchor(event));
  }

  function navigateEvent(event) {
    const anchor = findAnchor(event);
    const nextUrl = rewriteAnchor(anchor);

    if (!nextUrl) {
      return;
    }

    event.preventDefault();
    event.stopPropagation();

    const openInNewTab =
      event.type === 'auxclick' ||
      event.button === 1 ||
      event.metaKey ||
      event.ctrlKey ||
      anchor.target === '_blank';

    if (openInNewTab) {
      window.open(nextUrl, '_blank', 'noopener,noreferrer');
      return;
    }

    window.location.assign(nextUrl);
  }

  function rewriteLinks(root = document) {
    if (root.nodeType === Node.ELEMENT_NODE && root.matches?.('a[href]')) {
      rewriteAnchor(root);
    }

    root.querySelectorAll?.('a[href]').forEach(rewriteAnchor);
  }

  redirectCurrentPage();

  const earlyRewriteEvents = [
    'pointerover',
    'mouseover',
    'mousedown',
    'touchstart',
    'focus',
    'contextmenu',
  ];

  for (const eventName of earlyRewriteEvents) {
    document.addEventListener(eventName, rewriteEventLink, true);
  }

  document.addEventListener('click', navigateEvent, true);
  document.addEventListener('auxclick', navigateEvent, true);

  function startObserver() {
    rewriteLinks(document);

    const observer = new MutationObserver((mutations) => {
      for (const mutation of mutations) {
        if (
          mutation.type === 'attributes' &&
          mutation.target.matches?.('a[href]')
        ) {
          rewriteAnchor(mutation.target);
        }

        for (const node of mutation.addedNodes) {
          rewriteLinks(node);
        }
      }
    });

    observer.observe(document.documentElement, {
      childList: true,
      subtree: true,
      attributes: true,
      attributeFilter: ['href'],
    });
  }

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', startObserver, { once: true });
  } else {
    startObserver();
  }
})();